code: def nonzero(
      x: Union[(None, mx.ndarray.NDArray)],
      /,
      *,
      as_tuple: bool = True,
      size: Optional[int] = None,
      fill_value: Number = 0,
  ) -> Union[
      (
          None,
          mx.ndarray.NDArray,
          Tuple[Union[(None, mx.ndarray.NDArray)]],
      )
  ]:
      raise IvyNotImplementedException()
  
file_path: ivy/ivy/functional/backends/mxnet/searching.py
imports: import mxnet
  from numbers import Number
  from typing import Optional, Union, Tuple
  import numpy
  import ivy
  from ivy.utils.exceptions import IvyNotImplementedException
label_desc: Use image node_id 3 for calling a global function with example usage: nonzero() without return types